花畑 is a name I am fond of using atin online game sites.

At first, I had to decide on whether I should go for beingo funny by disrespecting myself or not.

Flower Field in the BrainYour Head

I only changed this so that it matches the change I made further down.

花畑 is a name I am fond of using aton online game sites.

お花畑 has a connotation to a Japanese phrase, 頭お花畑, that means happily beliving in a fantasy land, maybe chasing a butterfly as though there's a flower field in the brainyour head.

"flower field in your head" sounds more natural, but "flower field in the brain" isn't wrong.

I liked that idea very much, too, but I chose 花畑 without お, instead.

This is also good because it's like a family name, but at least II've never met anyone of this family name.

So, I figured this is suitable as an ID username for online places for fun.

花畑 is a username I am fond of using atin online game sites.

(1) If you're specifically referring to your name inside the game, you can also say "username"
(2) Sure you could say "online game sites", but that's a bit wordy. Saying "games" is enough, or "browser games" if you have to search for them online. If you downloaded it, then "video games".

At first, I had to decide on whether I go funny by disrespecting myself or notwould go with a funny name by making fun of myself.

(1) I don't think "disrespecting" is the right word for this context... maybe "making fun of"? Or "poking fun at"?
Note: Jokes that funnily "disrespect" yourself are called "self-deprecating jokes"

お花畑 has a connotation to aOn the other hand, お花畑 alludes to the Japanese phrase,saying 頭お花畑, thatwhich means to happily being in a fantasy land, maybe chasing a butterfly as though there's a flower field in the brain.

(1) when something has a connotation to another thing or seems to point to another event, saying, idea, et cetera, you can use the verb "to allude to". e.g. Joan Lindsay's description of the college's garden alludes to the biblical garden of Eden.
(2) you could also say "idiom" instead of "saying"
(3) you're introducing this sentence as a separate idea from your initial introduction of 花畑, so you should use a conjunction to begin your sentence.

I liked that idea very much, too, but I chose 花畑 without お, instead.

ThisIt is also good because it's like a family name but at least I, though I have never met anyone ofwith this family name.

SoThus, I figured this iwas suitable as an ID name for online places for fun.

I don't know what game you're playing, but you could also say "username" as opposed to "ID name". That said, some games say "ID" instead of "username" so I get where you're coming from.

花畑 is a name I am fond oflike using at online game sites.

I was inspired by a decorating game that was full of cute and sweet items.

At first, I had to decide on whether I go funnyshould be self-deprecating by disrespecting myself or not.

お花畑 has a connotation to a Japanese phrase, 頭お花畑, that means happily being in a fantasy land, maybe chasing a butterfly as though there'syou had a flower field in the brain.

This is also good because it's like a family name but at least I never met anyone ofwith this family name.